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wrapping-and-unwrapping test of metallic wire
met.
金属线材缠绕-松懈试验
(【技】将试样沿螺旋方向以紧密的螺旋圈缠绕在规定直径的芯棒上,检验有镀层和无镀层金属线材承受缠绕和松懈塑性变形的能力并显示其缺陷及镀层结合牢固性的试验。)
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